Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
300.5885 54.2997 0.0035 24.5790 175.5194 4.1774645 54.262 TRIG_00539866
Foreground time interval of the image:
-0.004 20.365 (delta_t = 20.369 [sec])
Background time interval of the image:
-239.136 -0.004 (delta_t = 239.132 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
The mask-weighted light curves based on cleaned DPHs
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.004 sec. to 41.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85980 ( -0.0401202 0.0402425 )
Norm@50keV : 1.59180E-02 ( -0.000328262 0.000328061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.40 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.903996e-01
Photon flux (15-150 keV) in 41.69 sec: 2.24641 ( -0.0537753 0.0540257 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10121e-06 ( -1.26161e-07 1.26226e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 41.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31845 ( -0.186476 0.179162 )
Epeak [keV] : 64.9226 ( -5.39422 8.46191 )
Norm@50keV : 2.88378E-02 ( -0.0050475 0.00641864 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.85 using 59 PHA bins.
# Reduced chi-squared = 0.6044 for 56 degrees of freedom
# Null hypothesis probability = 9.916379e-01
Photon flux (15-150 keV) in 41.69 sec: 2.13670 ( -0.06251 0.063 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83218e-06 ( -1.52335e-07 1.5221e-07 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 41.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03137 ( -0.376916 0.666614 )
beta : -2.14359 ( 2.14359 0.14159 )
Epeak [keV] : 53.9978 ( -11.6816 13.9975 )
Norm@50keV : 4.22082E-02 ( -0.0158942 0.069065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 31.40 using 59 PHA bins.
# Reduced chi-squared = 0.5709 for 55 degrees of freedom
# Null hypothesis probability = 9.956357e-01
Photon flux (15-150 keV) in 41.69 sec: 2.11429 ( 4.88571 -0.06749 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83218e-06 ( -5.83189e-06 -1.48208e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6052 ( )
R^2/D10^2 : 0.312942 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 410.13 using 59 PHA bins.
# Reduced chi-squared = 7.1953 for 57 degrees of freedom
# Null hypothesis probability = 6.631911e-55
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.113e-07 2.126e-08
25- 50 1.847e-06 5.086e-08
50-150 2.218e-06 9.610e-08
15-150 4.577e-06 9.797e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 102.555 (-8.20267 8.28179)
Norm : 9.54786 (-0.309033 0.357648)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.60 using 59 PHA bins.
# Reduced chi-squared = 0.5894 for 57 degrees of freedom
# Null hypothesis probability = 9.942802e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.040e-06 5.336e-08
25- 50 1.808e-06 6.587e-08
50-150 2.972e-06 6.410e-07
15-150 5.820e-06 6.670e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.33315 (-0.614873 0.640269)
R1^2/D10^2 : 2.06661 (-0.498727 0.730525)
kT2 [keV] : 22.9812 (-1.91141 2.45672)
R2^2/D10^2 : 3.17208E-02 (-0.0107462 0.0138825)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.92 using 59 PHA bins.
# Reduced chi-squared = 0.7985 for 55 degrees of freedom
# Null hypothesis probability = 8.582719e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.058e-07 6.337e-08
25- 50 1.852e-06 8.109e-08
50-150 2.937e-06 1.797e-07
15-150 5.695e-06 2.251e-07
Peak spectrum fit
Power-law model
Time interval is from 21.684 sec. to 22.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28674 ( -0.0479048 0.0479102 )
Norm@50keV : 0.108700 ( -0.00306498 0.00306489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.04 using 59 PHA bins.
# Reduced chi-squared = 1.422 for 57 degrees of freedom
# Null hypothesis probability = 1.989032e-02
Photon flux (15-150 keV) in 1 sec: 12.9371 ( -0.384024 0.384533 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07767e-06 ( -3.26175e-08 3.26576e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.684 sec. to 22.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.495255 ( -0.229841 0.219276 )
Epeak [keV] : 107.708 ( -12.3732 20.0233 )
Norm@50keV : 0.246696 ( -0.04887 0.0640944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.69 using 59 PHA bins.
# Reduced chi-squared = 0.6909 for 56 degrees of freedom
# Null hypothesis probability = 9.622937e-01
Photon flux (15-150 keV) in 1 sec: 12.4608 ( -0.4004 0.4017 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04356e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 21.684 sec. to 22.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.495245 ( -0.178819 0.222192 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 107.692 ( -7.32017 20.0247 )
Norm@50keV : 0.246699 ( -0.0488986 0.0640583 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.69 using 59 PHA bins.
# Reduced chi-squared = 0.7035 for 55 degrees of freedom
# Null hypothesis probability = 9.532089e-01
Photon flux (15-150 keV) in 1 sec: 12.4820 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.6911 ( )
R^2/D10^2 : 0.749452 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 173.94 using 59 PHA bins.
# Reduced chi-squared = 3.0517 for 57 degrees of freedom
# Null hypothesis probability = 9.218494e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.177e-08 2.865e-09
25- 50 2.461e-07 1.030e-08
50-150 6.297e-07 3.205e-08
15-150 9.276e-07 3.095e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 54.4004 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 152.73 using 59 PHA bins.
# Reduced chi-squared = 2.6794 for 57 degrees of freedom
# Null hypothesis probability = 1.110753e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.355e-07 4.000e-09
25- 50 2.606e-07 8.100e-09
50-150 5.715e-07 1.625e-08
15-150 9.675e-07 2.905e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.07149 (-1.28558 1.4531)
R1^2/D10^2 : 5.60792 (-2.06495 3.97118)
kT2 [keV] : 26.0516 (-2.29204 3.30942)
R2^2/D10^2 : 0.199818 (-0.0750364 0.0868923)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.40 using 59 PHA bins.
# Reduced chi-squared = 0.7527 for 55 degrees of freedom
# Null hypothesis probability = 9.126706e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.954e-08 1.190e-08
25- 50 2.516e-07 1.985e-08
50-150 6.987e-07 5.275e-08
15-150 1.040e-06 8.060e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76904 ( -0.0587064 0.0591205 )
Norm@50keV : 1.25844E-02 ( -0.000398432 0.000397416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.12 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.149842e-01
Photon flux (15-150 keV) in 20.37 sec: 1.71373 ( -0.0559358 0.0561044 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.363e-06 ( -7.69155e-08 7.71487e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25209 ( -0.273608 0.25742 )
Epeak [keV] : 71.3109 ( -9.77156 23.1585 )
Norm@50keV : 2.27912E-02 ( -0.00571839 0.00824893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.74 using 59 PHA bins.
# Reduced chi-squared = 0.9419 for 56 degrees of freedom
# Null hypothesis probability = 5.988834e-01
Photon flux (15-150 keV) in 20.37 sec: 1.64761 ( -0.06368 0.06391 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25469e-06 ( -9.29687e-08 9.31113e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15251 ( -0.304259 0.560994 )
beta : -2.20357 ( 2.20067 0.295766 )
Epeak [keV] : 65.4754 ( -18.0669 20.9179 )
Norm@50keV : 2.59214E-02 ( -0.00773378 0.0313581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9371 for 55 degrees of freedom
# Null hypothesis probability = 6.076304e-01
Photon flux (15-150 keV) in 20.37 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25439e-06 ( -2.25425e-06 -9.14206e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.76e-06
S(50-100 keV) = 1.93e-06
T90 vs. Hardness ratio plot
T90 = 23.4279999732971 sec.
Hardness ratio (energy fluence ratio) = 1.09659
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.24247
Count Ratio (50-100 keV) / (15-25 keV) = 0.741935
Mask shadow pattern
IMX = -4.559939090212756E-01, IMY = -3.573238866592082E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-239.136000 -0.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4636 35.3902 363.3 28.8 -95.5 0.0104 0.0 2.9 Her X-1
299.4137 35.1605 5.0 39.4 -160.8 0.7763 2.3 9.0 Cyg X-1
308.1338 40.9383 2.1 38.0 -175.0 1.6449 5.6 1.4 Cyg X-3
326.0407 38.3058 9.1 47.9 170.4 0.7221 1.3 6.2 Cyg X-2
324.4723 38.3784 2.2 47.2 171.7 2.7000 5.3 ------ UNKNOWN
324.4807 34.0491 2.2 50.8 174.8 3.3945 5.2 ------ UNKNOWN
289.9090 29.7618 2.6 40.8 -145.9 1.6792 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.004000 20.364600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5905 35.1948 25.6 29.0 -95.7 -0.0473 -0.5 11.0 Her X-1
299.4400 35.1441 8.8 39.4 -160.8 -0.1285 -1.3 8.1 Cyg X-1
308.0446 41.0376 4.1 37.9 -175.0 0.2798 2.8 5.9 Cyg X-3
326.2638 38.4253 13.8 47.9 170.1 -0.1406 -0.8 7.6 Cyg X-2
300.5884 54.2997 0.2 24.6 175.5 4.1775 54.3 ------ UNKNOWN
240.1661 58.3451 2.6 9.3 -39.2 0.2887 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
66.364620 962.932300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5338 35.4180 13.2 36.8 -62.1 -1.0880 -0.9 5.9 Her X-1
288.8183 10.9899 3.5 44.3 -123.8 9.0904 3.3 2.9 GRS 1915+105
299.7231 35.2986 3.7 19.0 -138.3 2.0112 3.1 8.7 Cyg X-1
308.1347 40.9689 1.1 14.3 -164.1 6.2916 10.9 1.5 Cyg X-3
326.2087 38.3983 5.1 23.6 161.6 1.3635 2.3 4.9 Cyg X-2
212.3328 46.2186 3.5 53.2 -20.1 4.8652 3.3 ------ UNKNOWN
210.3564 44.4269 3.7 55.4 -20.5 7.3215 3.2 ------ UNKNOWN
287.3865 21.7007 3.2 34.1 -118.2 3.7002 3.7 ------ UNKNOWN
314.4495 -2.4559 6.3 57.9 -156.8 8.2435 1.8 ------ UNKNOWN
215.7508 39.3165 5.1 56.3 -28.3 7.7806 2.3 ------ UNKNOWN
240.7347 32.3055 5.0 47.0 -53.0 7.2966 2.4 ------ UNKNOWN
273.0770 18.8825 3.6 41.2 -98.9 12.6728 3.3 ------ UNKNOWN
Plot creation:
Sat May 30 17:50:17 EDT 2015